This document is a PACCAR U1790A CAN message diagnostic guide covering DTC activation and repair procedures for MX EPA engines. Published by PACCAR and extracted from the Rapido technical portal, it explains how a U1790A CAN message code is triggered when CAN bus signals fall outside expected ranges and provides systematic repair verification steps for workshop technicians and fleet maintenance teams.
Document details and specifications — PACCAR U1790A CAN
| Brand | PACCAR |
| Model coverage | MX EPA Series engines |
| System/Group | DTCs / MX Europe Engines (EPA 2004 and EPA 2013) |
| Publication number | U1790 |
| Year/Revision | 18-Aug-17 |
| Pages | 2 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Table of contents
- Set conditions — CAN message reception and signal range validation
- Diagnostic condition — continuous monitoring during ignition and engine operation
- Corresponding OBD readiness monitor
- Reset condition — DTC inactivation after diagnostic pass
- Repair verification — step-by-step DTC clearing and test drive procedures
- Possible cause — corrupt or empty CAN messages and originating system malfunctions
- Additional information — message out of range DTC interpretation and cross-ECU communication example
Applies to these models
The PACCAR U1790A CAN message diagnostic applies to MX EPA Series engines, specifically MX_EPA04 and MX_EPA13 models. This document provides technical guidance for mechanics working on PACCAR commercial truck engines equipped with CAN bus network architecture. For official manufacturer information and additional resources, visit PACCAR official website.
Who needs this U1790A CAN message manual
Diesel truck mechanics and workshop owners diagnosing CAN communication faults on PACCAR MX EPA engines require this U1790A CAN message code guide. The document is essential for technicians troubleshooting DTC activation caused by out-of-range signal values and cross-ECU communication failures in CAN networks.
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